Water-level indicator for steam-generators.



, PATENTED APR. 21, 1903.

H. THIEMANN. I WATER LEVEL INDICATOR. FOR STEAM GENERATORS,

APPLICATION FILED MAY 26, 1902.

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' APPLIOATION FILED MAY 26, 1902.

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UNITED STATES HEINRICH THIEMANN,

PATENT Orricn.

OF STOLP, GERMANY.

WATER-LEVEL INDICATOR FOR STEAM-GENERATORS SPECIFICATION forming part of Letters Patent No. 726,203, dated April 21, 1903. Application filed May 26, 1902- Serial No. 109,081. (No model.)

T0 at whom it may concern:

Be it known that I, HEINRICH THIEMANN, a subject of the King of Prussia, Emperor of Germany, residing at 17 Kirchplatz, Stolp, in the Kingdom of Prussia and Empire of Germany, have invented new and useful Improvements in and'Relating to Water-Level Indicators of Steam-Generators, of which the following is a specification.

My inventionrelates to water-level indicators of steam-generators, and has for its'object to provide, in connection with a watergage, a device which indicates whether the water-level in the generator has descended below the lowest point admissible in order to attract the attention of the stoker, and thus prevent the explosion of the generator through a deficiency of water. This object is achieved by connecting with the lower tube of the water-gage a dropping-cock, through which water is allowed to pass continually from the generator, the water-level in the latter being shown to have sunk too low in case the dropping should cease. The gageglass is prolonged upward above the top of the generator-shell to obviate the filling of such glass through the condensation of steam therein when the upper or lower tube of the gage should become choked and create the false appearance of the generator being full.

of Water, while in reality the level has sunk to a dangerous depth.

In the accompanying drawings I haverepresented a constructional form of the invention.

Figure 1 is a front elevation, Fig. 2 a side elevation, and Fig. 3 a plan, of a generator to which the water-level indicator is applied. Fig. 4 shows the dropping device attached to the lower tube of the water-gage.

On reference to Figs. 1 to 3 it will be seen that the gage-glass a is connected through the upper tube 1) of the gage, all the bores of which are straight to facilitate cleaning, with the steam-space of the generator at the top of the latter, while the lower tube a of the gage is joined t6 the water-space of the boiler. The stop-cock din the lower tube c of the gagejsathree-way cock, which in the position shown sets the bore in the tube and the water-space of the generator in communication with the dropping-cock. To the tube of the gage is joined a box e, adapted to hold a sieve f upon radial ribs 9 in order to retain impurities. Below the box e is arranged a dropping-plate h, which has a small aperture therein and to which the dropping-cock t' is joined. This dropping-cock terminates below in the nozzlej, having a larger bore 01' aperture than the dropping-plate h. As the water drops down it is caught up bya cup is and conducted to the ash-pit.

In order'to obviate the condensation of the steam in the dropping device, this device is inclosed in a casing Z, so that at low-water level steam will pass from the nozzle 2". The casing l is formed in two halves secured together andformed with recesses at their upper ends to embrace the lower tube a and re-. cessed at their lower ends for the passage of the nozzle What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination with a water-gage, of a water-level indicator connected thereto and comprising a dropping mechanism having a diaphragm or plate provided with a small aperture to discharge water in drops so long as the proper amount of water remains in the boiler and thereby form a visual indicator or signal.

2. The combination in a water-gage, of a water-dropping mechanism at thelower end thereof separate and independent of the usual blow-off cock and adapted to discharge drops of water so long as the proper amount of water remains in the boiler, and an air-containing casing surrounding said dropping mechanism to prevent the condensation of steam therein. I

3. In a water-level indicator the combination, with the lower tube of the water-gage,

of a three-way stop-cock, a box connected therewith a sieve held in said box, a droppingplate secured to this box and a cock, substantially as described.

4. In a water-level indicator the combination, with the lower tube of the water-gage, of a three-Way stop-cock, a box connected therewith and furnished interiorly with ribs, a sieve held in said box, a dropping-plate secured to this box and having a small aperture 7 7. In a water-gage, a dropping-cock coniprising a chamber or box adapted for connection with said gage, an apertured droppingplate at the lower or outlet end of said chamher or box and a discharge-nozzle below said plate and having a bore of greater diameter than the aperture in the plate.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HEINRICH TI-IIEMANN.

Witnesses:

GEORG RISTER, OTTO DICK. 

